Mills has still to resolve his future as to where he might be playing next season.
Middlesbrough want Mills on a permanent basis, but Rangers and Birmingham were both reported to be ready to move in and try to lure Mills from them, but the defender's representative Neil Featherby insists he has had no talks with anyone.
"We are not in talks with any club including Middlesbrough at this moment," Featherby told skysports.com.
"Obviously the situation will be reviewed at the end of the season."